**1. The problem statement, all variables and given/known data**

Over a distance of 3 cm an electron accelerates uniformly from a speed of 9 x 10

^{3}m/s to a speed of 6 x 10

^{6}m/s. How long does it take the electron to cross this distance?

**2. Relevant equations**

d = 1/2(v_{0} + v)t

**3. The attempt at a solution**

Find t:

d = 3 cm /10 cm = 0.3 m

2 d / v_{0} + v = t

2 (0.3 m) / (9 x 10^{3} m/s + 6 x 10^{6} m/s) = t

This is where I got a little lost, especially with trying to do it on paper as I’m not able to use a calculator for the test.

http://ift.tt/1pKqynu